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ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... startup code before each compressed block:
[CODE]startup_block1:< ... decompressor routine with an extra byte at the beginning:
... :
pop hl ; extra byte
include dzx7_standard.asm
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... 1. Only sequences of same byte values are compressed. Thus, compression ... is poor and some kind block of bytes are not compressed ...Adding TAP file contents to a Spectrum +3e DOS PartitionHello my fellow WoS'ers, This thread is a companion to a great little guide from a fellow AmiBayer [B]mnjnurney[/B] you can view his thread by [URL…
... strangely familiar. The "Invalid Flag Byte" message is because of the ... ;" bytes"
REM read TAP block length & flag bytes
REM skip tape file data block (flag=255)
7000 LET ...Adding TAP file contents to a Spectrum +3e DOS PartitionHello my fellow WoS'ers, This thread is a companion to a great little guide from a fellow AmiBayer [B]mnjnurney[/B] you can view his thread by [URL…
... strangely familiar. The "Invalid Flag Byte" message is because of the ... ;" bytes"
REM read TAP block length & flag bytes
REM skip tape file data block (flag=255)
7000 LET ...Converting games to disk: difficult loadersThis thread has an spanish version in foro speccy, but I haven't gathered enough information to overcome my problems. I've been converting some game…
... to put breakpoints when a byte is sent to $7ffd or ... tape stop trigger when a block has finished or when it ...Converting games to disk: difficult loadersThis thread has an spanish version in foro speccy, but I haven't gathered enough information to overcome my problems. I've been converting some game…
... to put breakpoints when a byte is sent to $7ffd or ... tape stop trigger when a block has finished or when it ... emulation is stopped after all block had been loaded. Often the ...RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…
... some work on compressing some block graphics (1/3 of screen ... never stored in the same byte), the control bits would introduce ...Adding TAP file contents to a Spectrum +3e DOS PartitionHello my fellow WoS'ers, This thread is a companion to a great little guide from a fellow AmiBayer [B]mnjnurney[/B] you can view his thread by [URL…
I've got TAP2DSK creating the executable loader now. I've tidied up the display a bit (aligning the numbers) and added a couple of little progress indicators, plus now it displays the new loader lines as it builds them.
[center][img]http://www ...ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... presume there is a header block attached to the data? If ... , then I *must* compress a block larger than 16 bytes in ... ? Something in T-states per byte?ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... presume there is a header block attached to the data? ... (to indicate end of compressed block).
However compression ... ? Something in T-states per byte?[/QUOTE]
There' ... 84 T-states per uncompressed byte, although there's obviously some ...SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]
...
%load reported either "Incorrect block type" error or loaded corrupted ... .211.0 which is one byte removed from the previous manual ...Adding TAP file contents to a Spectrum +3e DOS PartitionHello my fellow WoS'ers, This thread is a companion to a great little guide from a fellow AmiBayer [B]mnjnurney[/B] you can view his thread by [URL…
... If the DOS_Demo m/code block is not found then DOS_Defn ... not visible as the high byte of the line number has ... If the DOS_Demo m/code block is not found then DOS_Defn ...Memory diagnostic toolIs there any sort of memory diagnostic tool for examining .Z80 files so I can easily identify large areas of blank memory? Scrolling through ZX Spin…
... 175 byte fragments it now prints the address of each matching block ...Getting PC into HLHello, here's a conundrum for you... Is there a way to obtain the value of the PC register (say into HL) without using absolute addressing such as C…
... the beginning of your code block or you will end up ... "default" value for a blank byte)?
A situation like ...Fastest redraw of screen from UDGsHere's a question for everyone, to generate a bit of code to be used in games: On a standard 48K Spectrum, what's the fastest way to redraw the scre…
... specific 1-4K block of RAM, spaced at 4-byte intervals. (This ... low bytes.) Then, within that block of RAM, stick lots of ... />
where n is the byte you want to write to ...Directly poking TAP and TZX files, is it possible?Whilst doing some POKEs to change the behaviour of one of my favourite games, I pondered on this: instead of doing MERGE "" and inserting POKEs befor…
... type of thing. It recreates parity when u change bytes in ... 5" strategically into the turboloader block, and its done. less than ...Sound programs that use +3DOS/AssemblerHi I am working on my final JSWed project and have nearly finished but i am considering changing the standard in game tune you get,the editor instruc…
... /> the tune as a block of memory) and Assembly ... directives. The rst byte is a command byte, which may then ... optional.
Command byte Number of parameter bytes ... 1 Rest. The parameter byte is the duration in jiffi ... .
The command byte is the pitch in ...Hangman .TAP doesn't work in Spectaculator 8.0Hello! I tried the game "Hangman" using the latest version of Spectaculator and nothing happens. The direct URL of the game is: [url]http://www.wor…
... blocks but the first code block is called with a wrong ... routine is the expected Flag byte which should be 0XFF for ...File comparitorI thought Taper might do it but its not quite what I was after. Unless I misunderstood that shows if tapes are identical or not but not the differenc…
... used for a simple byte comparison; comparing narrative text ... Each pair of 32 byte blocks is printed one on ... as a compressed hex byte. In the example picture ... k3) < k32): REM block length
NEXT i
block from each file
...16k programmingHi all, If I want to code something for a 16k (or any spectrum) my understanding was that if I CLEAR below 24064 and put all the code above it up to…
... 16K machine, your CODE block must take into account that ... Now, after saving your CODE block (to a TAP file perhaps ... CODE block loads, presenting the loading screen, and replacing every byte in ... byte doesn't match the calculated checksum for the loaded block ...Outrun Europa in colour - Level 1 ready !Instead of bumping these old threads: [url]http://www.worldofspectrum.org/forums/showthread.php?t=10754&highlight=outrun+europa[/url] [url]http://w…
...
first byte is lower byte of block nr
... Structure of 2nd byte: bits ... added to lower byte
bit 2 ? is block mirrored in ... the background
0: block uses own background
[/ ...Z80 internal compressionThis isn't exactly a ZX Spectrum problem, but since WOS probably has some of the best Z80 coders in the world, I thought I might ask anyway. For my …
... .
- The last byte of the data block is always $ff.
byte repetitions, it may be better ... bit for every "copy next byte to output") and fewer bits ...Spectaculator BlogHi All, I've decided to start a Spectaculator development blog [URL="http://www.spectaculator.com/category/blog"]here[/URL]. Normally months (somet…
Please, include in the Debugger two commands:
-fill the memory block with byte pattern
- copy memory "From: "To:"
same ones works for STS 2.6
thank you.ZX-Assembler in progress...Dear readers, I just want to announce that ZX-Assembler is not longer only an idea in my mind. It's just alive. Unfortunately, it's too early to mak…
... X (default zero)
[*]graphics block, N bytes wide (for instance ... redefined font will be 1 byte wide)
[*]numeric data, better ... />
[*] In case of graphics block, it would be nice to ...ZX-Assembler in progress...Dear readers, I just want to announce that ZX-Assembler is not longer only an idea in my mind. It's just alive. Unfortunately, it's too early to mak…
... comands while data would be .BYTE strings.[/QUOTE]
Yes ... (even tapes) and edit a block in ZX-Assembler. There's ... X (default zero)
graphics block, N bytes wide (for instance ... redefined font will be 1 byte wide)
numeric data, better ...Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…
... Hits 1
[*]Tomahawk - Byte Back
[*]Top Gun - ... after the second data block. [URL="http://velesoft.speccy ... after the first data block. [URL="http://alessandrogrussu.altervista ... after the second data block. [URL="http://alessandrogrussu.altervista ...Horizontal Scrolling/Per Character gamesHello. Can anyone give me the titles of some Speccy games (preferably good ones, but I don't mind hearing about bad ones too) that scroll the playin…
... of commands either skips a byte or rotates it in-place ... carried over to the next byte if it too is ... copy the data for each block in turn.
... hidden screen with just one byte per character. Then you have ... attribute map and a mask byte for each UDG's ...
